If this is happening to your french doors also known as french windows then it s most likely because they have become misaligned.
My french doors wont unlock.
And it s easy to see why on french doors the weak point is where the 2 doors come together on sliding glass doors the weak point is the standard hook type lock that the manufacturers provide.
How to fix a french door that won t unlock step 1.
If you can open your french doors you can check the hinges as well as the door handle and fastening.
Either due to wear and tear on the hinges if they re older doors or a poor installation if they re newer.
Why won t my french doors close properly.
If the doors cannot open at all use a flashlight to check the gap between the doors and the frame for anything amiss.
This just happened to my outswing patio door.
Disassemble the door knob that contains the lock on the french doors using a screwdriver to loosen and remove.
Test the french doors by swinging them back and forth to check for resistance or any strange noises.
If this fails move on to the next step.
It was an easy fix.
Press down firmly on the push button release while pushing out on the door to release the tension.
Remove the interior eustucion plate with a screwdriver and 1 8 inch hex key to remove the door handle.
As reliable as they can be if you ve had your french doors installed for a while they might develop problems opening and closing.
Try the push button release again.
The plate comes off revealing that the lock knob is merely slotted to a square rod.
You could take the cap off the hinge where you would need an allen key to adjust the door hinges it does sound like the locking system has stopped working properly we do come out and give free quotes it is some thing we come across quiet often usually if the door is quite old it usually requires a new locking system.
If there is still no change extend the opener to its max by pushing the door outward firmly.